A 6.6KV,10MVA star connected alternator has a reactance of 2Ω per phase and negligible resistance. Merz-Price protection is used for winding protection. The neutral grounding resistance is 5Ω. If only 10% of the winding is to remain unprotected, the setting of the relay is
O 7.6%
O 8.7%
O 7.8%
O 6.7%